popularized by Jack Black in his "Anchorman" cameo after he punts Baxter off the bridge.
it means "that's how I do things, if you don't like it, too bad. I am an independent person and I scoff at your preconceived notions of society."
Ron Burgundy: "wait, what are you doing?!"
(Jack Black punts Baxter, Ron's dog, off the bridge)
Jack: "That's how I roll"